My boyfriend and I had sex about two weeks ago and we’re not entirely sure he pulled out in time (there was no condom). I’ve been having dull cramps in my uterus area as well as some fatigue and nausea for the last three days. I’m not too worried yet since, according to this app, my period is due tomorrow, however, I am concerned because these symptoms are not my usual symptoms I experience before starting my period. My question(s): what exactly is a good indicator that I may or may not be pregnant? And if I were, how soon could I start feeling symptoms?